A very nice place, quiet and relaxing. If you have time, don't miss it! Near is the Cotroceni Palace, a must see of the city. You can visit it only with a previous call. More info on http://www.muzeulcotroceni.ro/
The gardens stretch on a 17 hectares area. Founded in 1860, the Botanical Gardens were moved in the actual place in 1892, when the Botanical Institute was built; it was however destroyed during the great air raid of April 4, 1944. In 1961 the Botanical Museum was opened, hosted by a building set up in Brâncoveanu style (to the left as you enter the main gate). The herbarum hosts half a million pages with dry collections of plants, while the greenhouses host rare and exotic plants. The gardens themselves are a pleasant place for a walk.
Note: There is however a strong touch of wartimes' ruin, as many alleys are not being taken care of, bushes are overgrown and certain areas are totally abandoned.
The Bucharest Botanical Garden is large enough to have a decent collection of plants from all over the world. In the park you can enjoy different aspects of plant gardens or real micro-habitats. Besides the park itself, there is a green house in which you can see wonderful plants raised in their special condiions.